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E.S Kannan,Gil Ho Kim,D. H. Youn,Chi-Te Liang,Jing-Han Chen,Jyun-Ying Lin,Kuang Yao Chen,Kwang-Yong Kang,Li-Hung Lin,N.C. Chen,Zhi-Yao Zhang 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.6
We report comparative magnetoresistance measurements of the two-dimensional electron gas formed in two different GaN/AlGaN quantum well structures with different starting disorder. The longitudinal magnetoresistance measurements for both the samples exhibited temperature-independent crossing points, evidence for a weak insulator - quantum Hall transition. Our data suggest that the onset of Landau quantization does not correspond to the crossing point. Moreover, the effect of the electron-electron interaction must be taken into account because the Hall resistivity shows a strong temperature dependence in the more disordered sample. Our experimental results, therefore, urge further studies on the low-field weak insulator - quantum Hall transition
Kannan, S.,Venkatachalam, G.,Lee, H.J.,Min, B.K.,Kim, W.,Koo, E.,Do, Y.R.,Yoon, S. Pergamon Press 2011 Polyhedron Vol.30 No.2
The metal coordination geometry in the active site of metalloproteins are very different from the one of small inorganic complexes, due to the inflexibility of the ligand set from amino acid side chains different from freely moving ligand set in synthesis. Using the sterically hindered 2,6-di-(p-fluorophenyl)benzoate(L) ligand, a series of mononuclear Co(II), Ni(II) and Cu(II) complexes of general formula [M(L)<SUB>2</SUB>(Hdmpz)<SUB>2</SUB>] (where, Hdmpz=3,5-dimethyl pyrazole) have been synthesized and characterized by the variety of spectroscopic methods. A distorted octahedral geometry in case of nickel, tetrahedral geometry for cobalt and square pyramidal in copper was observed in the X-ray studies, which also revealed that the uncoordinated oxygen atom of the carboxylate group forms intramolecular hydrogen bonding with the N-H group of the coordinated 3,5-dimethylpyrazole in case of cobalt and copper.
Kannan, E S,Karamad, M,Kim, Gil-Ho,Farrer, I,Ritchie, D A IOP Pub 2010 Journal of physics, an Institute of Physics journa Vol.22 No.4
<P>Magnetotransport measurements were performed in two widely separated double quantum well systems with different starting disorders. In the weak magnetic field regime, a crossover from negative to positive magnetoresistance in the longitudinal resistivity was observed in the system with weak disorder when the electron densities in the neighboring wells were significantly unbalanced. The crossover was found to be the result of the exchange-energy-assisted interactions between the electrons occupying the lowest subbands in the neighboring wells. In the case of the system with strong disorder short range scattering dominated the scattering process and no such transition in longitudinal resistivity in the low magnetic field regime was observed. However, at high magnetic fields, sharp peaks were observed in the Hall resistance due to the interaction between the edge states in the quantum Hall regime. </P>
S.K. Chaudhary,A. B. Mandal,R.Bhar,M. Gopi,A. Kannan,S. E. Jadhav,J.J. Rokade 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.1
Objective: This study investigated the effects of soapnut (Sapindus mukorossi) shell powder (SSP) on serum hormone level, egg quality, semen characteristics and reproductive performance of broiler breeders fed with a maize-soybean meal based diet. Methods: Ninety six female and twenty four male CARIBRO-VISHAL broiler breeders, 38-week old, were individually caged and randomly allocated to four treatment groups (24 female breeders/treatment and 6 male breeders/treatment): an un-supplemented control (T1) and three groups with 0.0176% SSP (group T2), 0.026% SSP (group T3) and 0.0528% SSP (group T4), to have supplementary saponin at 0, 50, 75, and 150 ppm, respectively, for 42 days. Results: The results indicated that serum (p<0.001) and seminal plasma (p<0.05) testosterone level, semen volume (p<0.001), mass motility (p<0.001), and live spermatozoa count (p<0.001) was increased in groups T3 and T4 compared to T2 and control groups. Compared with control group, total sperm count was increased (p<0.001) and dead spermatozoa count was decreased (p<0.001) in SSP supplemented groups. Supplementation of SSP did not affected the quality of egg lay. Compared with control group, fertility (p<0.01) and hatchability (total eggs set and fertile eggs set) (p<0.001) were significantly improved in SSP supplemented groups with the highest improvement in T3 treatment group. Embryonic death was decreased (p< 0.001) in SSP supplemented groups compared to control; lowest embryonic death was recorded in T3 treatment group. Conclusion: Thus, it was concluded that dietary supplementation of 0.026% SSP (saponin equivalent 75 ppm) improved the reproductive performance of broiler breeders.
High performance MoS<sub>2</sub>-based field-effect transistor enabled by hydrazine doping
Lim, Dongsuk,Kannan, E S,Lee, Inyeal,Rathi, Servin,Li, Lijun,Lee, Yoontae,Khan, Muhammad Atif,Kang, Moonshik,Park, Jinwoo,Kim, Gil-Ho IOP 2016 Nanotechnology Vol.27 No.22
<P>We investigated the n-type doping effect of hydrazine on the electrical characteristics of a molybdenum disulphide (MoS<SUB>2</SUB>)-based field-effect transistor (FET). The threshold voltage of the MoS<SUB>2</SUB> FET shifted towards more negative values (from −20 to −70 V) on treating with 100% hydrazine solution with the channel current increasing from 0.5 to 25 <I>μ</I>A at zero gate bias. The inverse subthreshold slope decreased sharply on doping, while the ON/OFF ratio increased by a factor of 100. Gate–channel coupling improved with doping, which facilitates the reduction of channel length between the source and drain electrodes without compromising on the transistor performance, making the MoS<SUB>2</SUB>-based FET easily scalable.</P>
A. Venkatesan,E.S. Kannan 한국물리학회 2017 Current Applied Physics Vol.17 No.5
Highly ordered Copper Oxide (Cu2O) nanopillars were successfully grown inside the porous anodized alumina (AAO) template by electrodeposition technique. To liberate the AAO template to get the free standing nanopillars, several etching trials were conducted using sodium hydroxide (NaOH) solution of varying concentration (ranging from 1 M to 5 M) and reaction time (8e60 min). On investigating the etched samples using scanning electron microscope, it was found that the sample treated with 1 M NaOH for 60 min yielded AAO template free standing vertically aligned nanopillars. Resistances of these nanopillars were found to be three orders of magnitude greater than the thin film which was used as a control sample. The temperature dependent (180e300 K) current-voltage (I-V) measurement on nanopillars showed non-linear characteristics which was analyzed using back to back schottky diode model and thermionic field emission (TFE) theory. Our calculations revealed that the carrier transport is diffusive (mean free path ¼ 8.9 nm < < length of nanopillars ¼ 4 mm) in nature and the existence of defect sites with activation energies of 0.3 and 0.6 eV which acts as hole traps. This present work demonstrates a reliable technique for realizing vertically aligned Cu2O nanopillars which could find application in solar cell, gas sensors, Li ion batteries, and memory devices.
Jang, H. R.,Yoo, E. S.,Kannan, R.,Kim, J. S.,Lee, K.,Yoo, D. J. Springer Science + Business Media 2017 Colloid and Polymer Science Vol.295 No.6
<P>Sulfonated poly(ether ether ketone) and graphene oxide nanocomposite-based polymer electrolyte membranes were prepared by facile solution casting method, and their applications for single cell were investigated. The degree of sulfonation played an important role in the proton conductivity of polymer electrolytes. Thus, we studied both the low and high degree of sulfonated poly ether ether ketones (SPEEKs) as composite with amphiphilic graphene oxide nanosheets (GNSs). The obtained results on water uptake and swelling profile showed that the physical and chemical properties of polymer electrolytes significantly improved after insertion of GNS. Morphological properties of the fabricated membranes were investigated with field emission scanning electron microscopy (FE-SEM), and the equal dispersion of GNS sheets throughout the cross section of polymer matrix was observed. The temperature-dependent conductivity reveals that SPEEK-GNS composite showed improved proton conductivity compared to pure SPEEK, because of the high degree of dispersion of GNS thus facilitated the extension of proton transport channels. Best enhancement in conductivity is observed for composite membrane containing 1.0 wt% of GNS, i.e., 149 mS cm(-1).</P>
Venkatesan, A,Rathi, Servin,Lee, In-Yeal,Park, Jinwoo,Lim, Dongsuk,Kim, Gil-Ho,Kannan, E S Institute of Physics 2016 Semiconductor science and technology Vol.31 No.12
<P>In this paper, we have demonstrated a low temperature hydrogen (H<SUB>2</SUB>) sensor based on reduced graphene oxide (rGO) and tin oxide nanoflowers (SnO<SUB>2</SUB> NFs) hybrid composite film. The addition of SnO<SUB>2</SUB> NFs into rGO solution inhibits irreversible restacking and agglomeration of rGO and increases the active surface area for interaction with H<SUB>2</SUB>. This rGO-SnO<SUB>2</SUB> NFs hybrid film sensor showed an excellent response to H<SUB>2</SUB> at 60 °C at 200 ppm with an improvement of 126% compared to pure rGO which was used as a control sample. The sensor also showed good response and recovery time in comparison to pure rGO film. The highly improved H<SUB>2</SUB> sensing characteristics of rGO-SnO<SUB>2</SUB> NFs hybrid are due to its (a) unique structural geometry that increased the surface area for H<SUB>2</SUB> adsorption, and (b) change in the width of depletion layer at the interface due to H<SUB>2</SUB> interaction.</P>